Paper-making machines



March 6, 1956 Filed April 22, 1952 Attorneys PAPER-MAKING MACHINES RalphC. Heys, .Sheflield,.England,iassignor to Millspaugh Limited, Sheffield, England ApplicationfAp'ril-22, 1952, Srial1No. 283,541

sclaims. (61.9244) This invention relates to paper-making machines, and this application is a continuation-in-part of application Serial No. 168,884, filed June 19, 1950, now Patent No. 2,677,316.

The invention is concerned with deckles for controlling the width of the layer of stock fed to the forming surface of the machine. Its object is to provide a deckle that not only controls the width but produces a clean sharp edge.

According to the present invention, a deckle comprises a wall, a resilient sealing strip adapted to contact the forming surface, a longitudinal channel in the contacting surface of the sealing strip, and an internal passage communicating with the longitudinal channel for the supply of pressure fluid to the channel. Advantageously, the deckle body is of metal, and the sealing strip is bonded to it.

The deckle may be used in paper-making machines in general. Two applications are shown in the accompanying drawings, in which Figure 1 is a sectional side elevation of one form of mechanism;

Figures 2 and 3 are respectively a section and plan taken on the lines 22 and 3-3 of Figure 1;

Figure 4 is a view corresponding to Figure 1 showing another form of mechanism;

Figure 5 is a sectional side elevation;

Figure 6 is a plan of Figure 1; and

Figure 7 is a section on the line 77 of Figure 5.

In Figure 1, a layer of stock 1 flowing along a trough formed by side plates 2 and a bottom plate 3 passes under an inclined evener board or slice 4 and then under an evener roll 5 positioned generally above a suction breast roll 6 and vertically adjustable by adjusting screws 7. The roll 5 has a peripheral speed approximately equal to that of the stock 1 and the wire 8 passing from the breast roll 6 beyond the forward end 9 of the trough.

The plates 2 are connected to the ends of metal deckle walls 10 '(one only shown) each comprising an internal passage 11 (Figure 3) for pressure water or air communicating by drilled holes 12 to and through a sealing strip 13 of rubber or like resilient material bonded to the lower face of the metal. A longitudinal channel 14 in the face of the rubber contacting the forming wire receives the flow of pressure water or air. The water or air is supplied by appropriate connections 15. A transverse support 16 on pillars 17 (one only shown in Figures 1 and 2) carries the deckle walls 10, from the shake r 19. l

In Figure 4, the deckle walls 10 continue the trough side walls 2, which end just above the breast roll 6, where they carry an adjustable inclined evener board 18.

In Figures 5 to 7, the wire 20 makes contact with rather more than a quadrant of the suction breast roll 21, and stock is fed over this quadrant from a feed chamber 22 ending in a doctor 23, past vibrator arms 24 (rubbermounted at 25) to agitate the fibres in the stock, and into a tapering channel 26 formed by lower and upper plates 2,737,088 Patented Mar. 6, '1956 "ice -to a side wall 33. The slider 31 also carries a screw 34 and locking knobs 35 by means of which the gap 36 between the end 30 of the plate 28 and the roll 21 may be adjusted.

To the side wall 33 and flush with its inner face is secured a deckle 37, curved to the curvature of the roll 21. To the metal body of the deckle is bonded a resilient sealing strip 38 to contact the wire 20. A longitudinal channel 39 in the contacting surface of the strip 38 communicates by holes 40 with a longitudinal channel 41 in the metal body, and this is fed with pressure water or air from a connection 42.

The deckle 37 bounds one side of the tapering channel 26 from the vibrator arms 24 to the gap 36, and continues to the point where the wire 20 is about to leave the top of the roll 21. A constant supply of pressure water or air to the deckle maintains a steady flow from the whole length of the longitudinal channel 39 in the sealing strip 38, and this flow through the wire 20 and the perforations 43 of the roll 21 produces a clean sharp edge to the embryo paper web passing from the roll 21 on the wire 20 after the dewatering effected by the suction applied by the roll 21.

What I claim is:

1. In a vacuum-forming paper-making machine comprising a suction breast roll, a forming wire passing round the roll, and a channel for feeding stock to the wire where it is passing round the roll, the provision at each side of the feed channel of a deckle curved to the curvature of the breast roll, the deckle terminating in a resilient surface adapted to contact the surface of the wire to form a seal therewith, a longitudinal channel in the resilient surface, an internal passage in the wall communicating with the channel to form therewith a chamber the outlet of which is constituted by the longitudinal channel, and an inlet in the passage for the supply of pressure fluid to the channel.

2. In a paper-making machine comprising a suction breast roll, a forming wire passing round the roll, and a channel for feeding stock to the wire where it is passing round the roll, the provision at each side of the feed channel of a deckle curved to the curvature of the breast roll, the deckle terminating in a resilient surface adapted to contact the surface of the wire to form a seal therewith, a longitudinal channel in the resilient surface, an internal passage in the wall with holes connecting the internal passage and the longitudinal channel to form therewith a chamber the outlet of which is constituted by the longitudinal channel, and an inlet in the passage for the supply of pressure fluid to the channel.

3. In a paper-making machine with a deckle as in claim 1, the deckle being formed flush with the inner face of a side of the feed channel.

4. In a paper-making machine comprising a suction breast roll, and a forming wire passing round the roll, the provision of a deckle consisting of a wall having a metal body with a sealing strip secured to the body and terminating in a resilient surface adapted to contact the surface of the wire to form a seal therewith, a longitudinal channel in the resilient surface, an internal passage in the wall communicating with the longitudinal channel to form therewith a chamber the outlet of which is'constituted by the longitudinal channel, and an inlet in the passage for the supply of pressure fluid to the chamber.

5. In a paper-making machine comprising a suction breast roll, a forming wire passing round the roll, and a trough for feeding stock to the wire above the roll, the

provision of a deckle to continue each side wall of the trough along the wire, the deckle having a wall terminat ing in a resilient surface adapted to contact the surface of the wire to form a seal therewith, a longitudinal channel extending in the resilient surface over substantially the whole length of the wall to constitute over that length the lateral boundary of the web-forming portion of the wire surface, an internal passage in the wall communicating with thechannel to form therewith a chamber the outlet of which is constituted by the longitudinal channel, and an inlet in the passage for the supply of pressure fluid to the channel.

References Cited in the file of this patent UNITED STATES PATENTS Cline Mar. 6, Keeney July 10, Andrew Mar. 28, Gustafson Aug. 27, Nishina Dec. 16, Vickery Aug. 4, Vedder Nov. 5, Sinclair July 14, Goldfisher Sept. 7,

FOREIGN PATENTS Germany Nov. 19, 

